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Grade: 11
        The pressure in a vessel that contained pure oxygen dropped from 1000mm to 750mm in47 minutes as the oxygen is leaked through a small hole.when the same vessel was filled with another gas the pressure dropped from 1000mm to 750 in 74 minutes.What is the molecular weight of the second gas?
one year ago

Answers : (1)

Vikas TU
6887 Points
Rate of diffusion,
dP/dt => (1000-750)/47 = PA/root(32*T)..........(1)
 (1000-750)/74 = PA/root(M*T).............(2)
dividing both the eqns. we get,
M = (74/47)^2*32 = > 79.32 approx.
that is the molar mass of the Br gas.
one year ago
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